I think I should just get another transponder and redo the programming...
but many special thanks to you guys for giving me the guts and courage I lacked to unsolder such big eeprom..It was my first time though

I will go tonight after knocking off the workshop..and I WILL REPORT

did you reset immo and reprogram with the security code that matches your other units ?

Hello good people of Car Technology
First things first, I should take this opportunity to thank you for helping me,,I am forever thankful for that. I owe you guys a lot

I am happily breaking it to you guys that Opel Astra G has been successfully programmed. I could not do this without you. I had this case as my manual all along the way. I used each and every view without hesitation because i trust you guys with your knowledge about cars.

1. I changed transponder chip. Precoded one
2. I went to immobilizer functions, entered security code and all the buttons that were not active became active. 3. I then reset ECU and Immobilizer from this immo section using the login code gotten from the car's Immo ring MCU dump4. went to Key Learning, entered the code and deleted all keys5. clicked program key and remote...and it was done in less than 15 seconds6. The car started just fine.

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Use the information at your own risk